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added Determinants to Library

Traces, Determinant of square matrices and some properties

added Euclidean_Space and Glbs to Library

fixed proof -- removed unnecessary sorry

Fixed theorem reference

(Real) Vectors in Euclidean space, and elementary linear algebra.

A generic decision procedure for linear rea arithmetic and normed vector spaces

Permutations, both general and specifically on finite sets.

Imports Main in order to avoid the typerep problem

A theory of greatest lower bounds